Hen question

I have a Silver Laced Wyandotte hen and rooster 1 each. I know it's a bad combo but a hawk got my other hen. Anyway iv been wondering, I would like more chickens and I have heard that Wyandottes are great moms.. Just one question.. I'm pretty sure the roosters been doing his thing to my hen and how to I get her to lay on a fertile egg? I have NO clue what to do. So any suggestions help!! My hens about 27 weeks and my roosters about 30 weeks. I apologize if I come across as a little bit of a dummie for asking.

Welcome to BYC. Glad you decided to our flock. I'm sorry about your loss of the hen to a hawk. It's always sad to lose one of our flock. X2 on Percheron chick. Broodiness is a hormonal state over which we have no control. Please feel free to ask any other questions you may have. We are here to help in any way we can. Good luck with your Wyandottes.